/Engine/Source/Runtime/Engine/Classes/Engine/Level.h
Set before calling LoadPackage for a streaming level to ensure that OwningWorld is correct on the Level
static [TMap](API\Runtime\Core\Containers\TMap)< [FName](API\Runtime\Core\UObject\FName), [TWeakObjectPtr](API\Runtime\Core\UObject\TWeakObjectPtr)< [UWorld](API\Runtime\Engine\Engine\UWorld) > > StreamedLevelsOwningWorld;